Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 48, Problem 4SQ
To determine
Mention the preferred method of the plugging switch connection to the motor or the driven machine.
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An inner-city electric bus with 7,200kg weight and average speed of 72 km/hour operates using a hybrid power source of lithium-ion battery pack and a bank of super capacitor. equipped with a lithium battery pack and a bank of supercapacitor. The energy content of the supercapacitor bank is twice the regenerative breaking energy of the electric bus at average speed. The electric bus commutes 490 km per charged battery and consumes 400 Wh/km.
Design the supercapacitor bank to provide 100V output, based on supercapacitor cells with 3600F capacitance and 2V.
Calculate the energy density of the supercapacitor at the cell level, assume cells with 10cm diameter and 15 cm height.
3. Design the battery pack for the electric bus by assuming that the energy of regenerative breaking will not be used for commuting but used to run the vehicle’s accessories. The unit cell of the battery pack is a lithium-ion…
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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- A rod coincident with the z-axis extends from 0 to -L. If the rod carries a uniform charge density of pL (a) calculate the electric field intensity at a point h on the z-axis. (b) Use your answer to show that when h>>L the rod behaves as a point charge of value plL . (c) How much larger than the length of the rod must h be in order that the answer to part b) is a reasonably accurate estimate.arrow_forwardThe separation of two point charges with charges Q1=36pC and ,Q2=9pC respectively, is 3 cm. If a third point charge Q3 is placed on the line joining Q1 and Q2 at a distance d from Q1 find Q3 and d that ensures that the force on all charges is zero.arrow_forward5. The electric field on the positive z-axis due to a uniformly charged disk of radius a that lies in the x-y plane with center at the origin is claimed to be given by - Ps Z 2E 2 a² + z² Where ps is the surface charge density on the disk. Without deriving this formula, evaluate it for its probable correctness. (a) Is its symmetry correct? Explain. (b) If z>> a, it reduces to that of a point charge of value a²ps (c) if z> z is large the formula reduces to that of an infinite plane.arrow_forward
- A rod coincident with the z-axis extends from 0 to L. If the rod carries a uniform charge density of pL , calculate the electric field intensity at a point h on the y-axis.arrow_forwardLet the x-axis carry a line charge of 2 nC/m and a plane Z=3 carry a surface charge of 5 nC/m^2. If a point charge of 100pC is located at (4,1,-3), find E at (1, 1,1).arrow_forwardConsider the circuit in Fig. 4. (a) Use mesh analysis to find the currents i1, i2, i3. Hint use the supermode method. (10 marks) (b) Determine the Thévenin equivalent of the circuit that is connected to the dependent source (10 marks). (c) If the dependent source was replaced with a load resistor, what would be the value of its resistance so that the load would receive the maximum power from the rest of the circuit? (2 mark)arrow_forward
- Formal Charge Distribution vs Oxidation States Te- For the Lewis diagram, above, determine: 0 The overall charge of the molecular species shown. -2 The formal charge on the tellurium atom. +7 The formal oxidation number of the tellurium atom. 1 pts Submit Answer Incorrect. Tries 3/5 Previous Tries Review: • For overall charge, compare the number of electrons depicted with the sum of the valence electrons for the free atoms. (Remember that an electron has a negative charge.) • Rules Governing Formal Charge • Rules for Assigning Oxidation States.arrow_forward. (a) Use mesh analysis to find the current i. (b) Determine the Norton equivalent of the circuit that is connected to the 5 ohm resistor (c) If the 5 ohm resistor was replaced with a load resistor, what would be the value of its resistance so that the load would receive the maximum power from the rest of the circuit?arrow_forwardImplement the ladder logic program needed to satisfy each of the following (assume inputs A, B and C are all normally open toggle switches). (a) When input A is closed, turn on output X, but hold on output Y until A opens. (b) When input A is closed and either input B or C is open, turn on output Y, otherwise it should be off. (c) When input A is closed or open, turn on output Y and turn off output X. (d) When input A is closed, turn on output X and turn off output Y.arrow_forward
- 2. Find the inverse Laplace transform of the following s -domain signals. 1 a) Y(s) = (s+4)²(s+3) S+7 b) Y(s) = (s²+6s+13) s²+2s+2 c) Y(s) = (s+2)2-32 d) Y(s) = (1-es - e-3s) $2arrow_forward4. Answer the following questions. Take help from ChatGPT to answer these questions (if you need). But write the answers briefly using your own words with no more than two sentences and make sure you check whether ChatGPT is giving you the appropriate answers in our context. A) What is the zero-input response? B) What is the zero-state response? C) What are pole, zero, and residue in the context of our class? D) What are the different methods for finding the inverse Laplace transform? Which one we used in this class?arrow_forward3. You have come to encounter an LTI system. You have no idea how the system behaves. So, you decide to drive the system with a particular input and measure the output. When you put the input u(t) = et 1(t), you find that the output y(t) = (1-e) 1(t). You can assume zero initial conditions. Now, find the transfer function of the system.arrow_forward
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